SELECT 
  ushop_ec_livecommerce_videos.*, 
  ushop_ec_livecommerce_videos_descriptions.video_title, 
  ushop_ec_livecommerce_videos_descriptions.description, 
  ushop_ec_livecommerce_videos_descriptions.lang_code 
FROM 
  ushop_ec_livecommerce_videos 
  LEFT JOIN ushop_ec_livecommerce_videos_descriptions ON ushop_ec_livecommerce_videos_descriptions.video_id = ushop_ec_livecommerce_videos.video_id 
  AND ushop_ec_livecommerce_videos_descriptions.lang_code = 'es' 
WHERE 
  1 
  AND ushop_ec_livecommerce_videos.storefront_id = 1 
  AND ushop_ec_livecommerce_videos.scheduled_time + ushop_ec_livecommerce_videos.video_duration < 1771276470 
ORDER BY 
  ushop_ec_livecommerce_videos.scheduled_time desc 
LIMIT 
  0, 8

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.00"
    },
    "ordering_operation": {
      "using_filesort": false,
      "nested_loop": [
        {
          "table": {
            "table_name": "ushop_ec_livecommerce_videos",
            "access_type": "system",
            "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": "2K"
            },
            "used_columns": [
              "video_id",
              "video_duration",
              "rec_video_duration",
              "yt_video_duration",
              "company_id",
              "storefront_id",
              "status",
              "product_ids",
              "scheduled_time",
              "timestamp",
              "stream_type",
              "yt_video",
              "filename"
            ]
          }
        },
        {
          "table": {
            "table_name": "ushop_ec_livecommerce_videos_descriptions",
            "access_type": "const",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "video_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "const",
              "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": "792"
            },
            "used_columns": [
              "video_id",
              "video_title",
              "description",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}