SELECT 
  video_id, 
  product_id 
FROM 
  cscart_ab__video_gallery 
WHERE 
  product_id IN (
    421, 1931, 1529, 1465, 1933, 428, 406, 
    390, 398, 435, 419, 324, 440, 431, 1934, 
    2000, 2001, 385, 405, 1937, 407, 402, 
    1936, 416
  )

Query time 0.00039

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 (421,1931,1529,1465,1933,428,406,390,398,435,419,324,440,431,1934,2000,2001,385,405,1937,407,402,1936,416))"
    }
  }
}