SELECT 
  SQL_CALC_FOUND_ROWS products.product_id, 
  descr1.product as product, 
  companies.company as company_name, 
  products.product_type, 
  products.parent_product_id 
FROM 
  ushop_products as products 
  LEFT JOIN ushop_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'en' 
  LEFT JOIN ushop_product_prices as prices ON prices.product_id = products.product_id 
  AND prices.lower_limit = 1 
  LEFT JOIN ushop_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN ushop_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN ushop_categories ON ushop_categories.category_id = products_categories.category_id 
  AND (
    ushop_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, ushop_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, ushop_categories.usergroup_ids
    )
  ) 
  AND ushop_categories.status IN ('A', 'H') 
  AND ushop_categories.storefront_id IN (0, 1) 
  LEFT JOIN ushop_cp_auctions as auctions ON products.product_id = auctions.product_id 
  LEFT JOIN ushop_users ON products.company_id = ushop_users.company_id 
  AND ushop_users.user_type = 'V' 
  AND ushop_users.user_id = 0 
  LEFT JOIN ushop_product_popularity as popularity ON popularity.product_id = products.product_id 
WHERE 
  1 
  AND ushop_categories.category_id IN (373) 
  AND products.product_id NOT IN (519) 
  AND companies.status IN ('A') 
  AND (
    products.amount > 0 
    OR products.tracking = 'D'
  ) 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND prices.usergroup_id IN (0, 0, 1) 
  AND products.parent_product_id = 0 
  AND (
    CASE WHEN (
      products.cp_active_auction_id > 0
    ) THEN (
      (
        auctions.users = '' 
        OR FIND_IN_SET(0, auctions.users)
      ) 
      AND auctions.show_on_category = 'Y'
    ) ELSE 1 END 
    OR ushop_users.company_id = products.company_id
  ) 
  AND products.product_type <> 'W' 
  AND products.product_type != 'D' 
GROUP BY 
  products.product_id 
ORDER BY 
  popularity.total desc, 
  products.product_id ASC 
LIMIT 
  0, 33

Query time 0.00223

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "26.59"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "nested_loop": [
          {
            "table": {
              "table_name": "ushop_categories",
              "access_type": "const",
              "possible_keys": [
                "PRIMARY",
                "c_status",
                "p_category_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id"
              ],
              "key_length": "3",
              "ref": [
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 1,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "0.10",
                "prefix_cost": "0.00",
                "data_read_per_join": "3K"
              },
              "used_columns": [
                "category_id",
                "storefront_id",
                "usergroup_ids",
                "status"
              ]
            }
          },
          {
            "table": {
              "table_name": "companies",
              "access_type": "ALL",
              "possible_keys": [
                "PRIMARY"
              ],
              "rows_examined_per_scan": 10,
              "rows_produced_per_join": 1,
              "filtered": "10.00",
              "cost_info": {
                "read_cost": "1.51",
                "eval_cost": "0.10",
                "prefix_cost": "1.61",
                "data_read_per_join": "6K"
              },
              "used_columns": [
                "company_id",
                "status",
                "company"
              ],
              "attached_condition": "(`marketplace`.`companies`.`status` = 'A')"
            }
          },
          {
            "table": {
              "table_name": "products_categories",
              "access_type": "range",
              "possible_keys": [
                "PRIMARY",
                "pt"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id",
                "product_id"
              ],
              "key_length": "6",
              "rows_examined_per_scan": 41,
              "rows_produced_per_join": 41,
              "filtered": "100.00",
              "using_index": true,
              "using_join_buffer": "hash join",
              "cost_info": {
                "read_cost": "4.61",
                "eval_cost": "4.10",
                "prefix_cost": "10.32",
                "data_read_per_join": "656"
              },
              "used_columns": [
                "product_id",
                "category_id"
              ],
              "attached_condition": "((`marketplace`.`products_categories`.`category_id` = 373) and (`marketplace`.`products_categories`.`product_id` <> 519))"
            }
          },
          {
            "table": {
              "table_name": "products",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "status",
                "idx_parent_product_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "marketplace.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 2,
              "filtered": "5.00",
              "cost_info": {
                "read_cost": "10.25",
                "eval_cost": "0.21",
                "prefix_cost": "24.67",
                "data_read_per_join": "8K"
              },
              "used_columns": [
                "product_id",
                "product_type",
                "status",
                "company_id",
                "amount",
                "usergroup_ids",
                "tracking",
                "parent_product_id",
                "cp_active_auction_id"
              ],
              "attached_condition": "((`marketplace`.`products`.`company_id` = `marketplace`.`companies`.`company_id`) and (`marketplace`.`products`.`parent_product_id` = 0) and ((`marketplace`.`products`.`amount` > 0) or (`marketplace`.`products`.`tracking` = 'D')) and ((`marketplace`.`products`.`usergroup_ids` = '') or (0 <> find_in_set(0,`marketplace`.`products`.`usergroup_ids`)) or (0 <> find_in_set(1,`marketplace`.`products`.`usergroup_ids`))) and (`marketplace`.`products`.`status` = 'A') and (`marketplace`.`products`.`product_type` <> 'W') and (`marketplace`.`products`.`product_type` <> 'D'))"
            }
          },
          {
            "table": {
              "table_name": "auctions",
              "access_type": "ref",
              "possible_keys": [
                "product_id"
              ],
              "key": "product_id",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "4",
              "ref": [
                "marketplace.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 2,
              "filtered": "100.00",
              "index_condition": "<if>(is_not_null_compl(auctions), (`marketplace`.`products_categories`.`product_id` = `marketplace`.`auctions`.`product_id`), true)",
              "cost_info": {
                "read_cost": "0.51",
                "eval_cost": "0.21",
                "prefix_cost": "25.38",
                "data_read_per_join": "426"
              },
              "used_columns": [
                "product_id",
                "users",
                "show_on_category"
              ]
            }
          },
          {
            "table": {
              "table_name": "prices",
              "access_type": "ref",
              "possible_keys": [
                "usergroup",
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "key": "usergroup",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "marketplace.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "29.77",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.51",
                "eval_cost": "0.06",
                "prefix_cost": "26.10",
                "data_read_per_join": "14"
              },
              "used_columns": [
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "attached_condition": "((`marketplace`.`prices`.`lower_limit` = 1) and (`marketplace`.`prices`.`usergroup_id` in (0,0,1)))"
            }
          },
          {
            "table": {
              "table_name": "ushop_users",
              "access_type": "const",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "user_id"
              ],
              "key_length": "3",
              "ref": [
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "0.06",
                "prefix_cost": "26.17",
                "data_read_per_join": "3K"
              },
              "used_columns": [
                "user_id",
                "user_type",
                "company_id"
              ],
              "attached_condition": "(<if>(found_match(ushop_users), ((0 <> (case when (`marketplace`.`products`.`cp_active_auction_id` > 0) then (((`marketplace`.`auctions`.`users` = '') or (0 <> find_in_set(0,`marketplace`.`auctions`.`users`))) and (`marketplace`.`auctions`.`show_on_category` = 'Y')) else 1 end)) or (`marketplace`.`ushop_users`.`company_id` = `marketplace`.`companies`.`company_id`)), true) and <if>(is_not_null_compl(ushop_users), ((`marketplace`.`ushop_users`.`company_id` = `marketplace`.`companies`.`company_id`) and (`marketplace`.`ushop_users`.`user_type` = 'V')), true))"
            }
          },
          {
            "table": {
              "table_name": "popularity",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "total"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "marketplace.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.15",
                "eval_cost": "0.06",
                "prefix_cost": "26.38",
                "data_read_per_join": "19"
              },
              "used_columns": [
                "product_id",
                "total"
              ]
            }
          },
          {
            "table": {
              "table_name": "descr1",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "product_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id",
                "lang_code"
              ],
              "key_length": "9",
              "ref": [
                "marketplace.products_categories.product_id",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.15",
                "eval_cost": "0.06",
                "prefix_cost": "26.59",
                "data_read_per_join": "3K"
              },
              "used_columns": [
                "product_id",
                "lang_code",
                "product"
              ]
            }
          }
        ]
      }
    }
  }
}