SELECT 
  product_id 
FROM 
  ushop_products 
WHERE 
  company_id = 2

Query time 0.00219

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "31.55"
    },
    "table": {
      "table_name": "ushop_products",
      "access_type": "ALL",
      "rows_examined_per_scan": 266,
      "rows_produced_per_join": 26,
      "filtered": "10.00",
      "cost_info": {
        "read_cost": "28.89",
        "eval_cost": "2.66",
        "prefix_cost": "31.55",
        "data_read_per_join": "114K"
      },
      "used_columns": [
        "product_id",
        "company_id"
      ],
      "attached_condition": "(`marketplace`.`ushop_products`.`company_id` = 2)"
    }
  }
}