SELECT 
  video_id, 
  product_id 
FROM 
  cscart_ab__video_gallery 
WHERE 
  product_id IN (
    421, 427, 408, 382, 418, 1930, 400, 424, 
    1931, 381, 1529, 1465, 428, 415, 391, 
    406, 329, 439, 390, 393, 394, 396, 397, 
    398
  )

Query time 0.00251

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.20"
    },
    "table": {
      "table_name": "cscart_ab__video_gallery",
      "access_type": "index",
      "possible_keys": [
        "product_id"
      ],
      "key": "product_id",
      "used_key_parts": [
        "product_id"
      ],
      "key_length": "3",
      "rows_examined_per_scan": 1,
      "rows_produced_per_join": 1,
      "filtered": "100.00",
      "using_index": true,
      "cost_info": {
        "read_cost": "1.00",
        "eval_cost": "0.20",
        "prefix_cost": "1.20",
        "data_read_per_join": "64"
      },
      "used_columns": [
        "video_id",
        "product_id"
      ],
      "attached_condition": "(`eshopuga_upgr_4122`.`cscart_ab__video_gallery`.`product_id` in (421,427,408,382,418,1930,400,424,1931,381,1529,1465,428,415,391,406,329,439,390,393,394,396,397,398))"
    }
  }
}