SELECT 
  video_id, 
  product_id 
FROM 
  q_ab__video_gallery 
WHERE 
  product_id IN (
    18673, 18681, 15384, 15385, 15387, 15388, 
    15389, 15391, 15392, 15393, 15394, 
    15395, 15396, 15397, 15398, 15400, 
    15401, 15403
  )

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "8.22"
    },
    "table": {
      "table_name": "q_ab__video_gallery",
      "access_type": "range",
      "possible_keys": [
        "product_id"
      ],
      "key": "product_id",
      "used_key_parts": [
        "product_id"
      ],
      "key_length": "3",
      "rows_examined_per_scan": 18,
      "rows_produced_per_join": 18,
      "filtered": "100.00",
      "using_index": true,
      "cost_info": {
        "read_cost": "4.62",
        "eval_cost": "3.60",
        "prefix_cost": "8.22",
        "data_read_per_join": "1K"
      },
      "used_columns": [
        "video_id",
        "product_id"
      ],
      "attached_condition": "(`portal`.`q_ab__video_gallery`.`product_id` in (18673,18681,15384,15385,15387,15388,15389,15391,15392,15393,15394,15395,15396,15397,15398,15400,15401,15403))"
    }
  }
}