SELECT 
  product_id 
FROM 
  cscart_product_popularity 
WHERE 
  product_id IN (
    11106, 11107, 11105, 11104, 11103, 11102, 
    11101, 11100, 11099, 11098, 11097, 
    11096, 11095, 11094, 11093, 11092, 
    11091, 11090, 11110, 11109, 11108
  )

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "4.56"
    },
    "table": {
      "table_name": "cscart_product_popularity",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "total"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id"
      ],
      "key_length": "3",
      "rows_examined_per_scan": 21,
      "rows_produced_per_join": 21,
      "filtered": "100.00",
      "using_index": true,
      "cost_info": {
        "read_cost": "2.46",
        "eval_cost": "2.10",
        "prefix_cost": "4.56",
        "data_read_per_join": "672"
      },
      "used_columns": [
        "product_id"
      ],
      "attached_condition": "(`gaseus`.`cscart_product_popularity`.`product_id` in (11106,11107,11105,11104,11103,11102,11101,11100,11099,11098,11097,11096,11095,11094,11093,11092,11091,11090,11110,11109,11108))"
    }
  }
}