SELECT 
  product_id 
FROM 
  cscart_product_popularity 
WHERE 
  product_id IN (
    7108, 7109, 7224, 7225, 7246, 7245, 7268, 
    7267, 7271, 7270, 6844, 6854, 3307, 
    6864, 6860, 6855, 3317, 3313, 3862
  )

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "4.15"
    },
    "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": 19,
      "rows_produced_per_join": 19,
      "filtered": "100.00",
      "using_index": true,
      "cost_info": {
        "read_cost": "2.25",
        "eval_cost": "1.90",
        "prefix_cost": "4.15",
        "data_read_per_join": "608"
      },
      "used_columns": [
        "product_id"
      ],
      "attached_condition": "(`gaseus`.`cscart_product_popularity`.`product_id` in (7108,7109,7224,7225,7246,7245,7268,7267,7271,7270,6844,6854,3307,6864,6860,6855,3317,3313,3862))"
    }
  }
}