SELECT 
  cscart_product_review_prepared_data.product_id AS product_id, 
  cscart_product_review_prepared_data.average_rating AS average_rating, 
  cscart_product_review_prepared_data.reviews_count AS reviews_count 
FROM 
  cscart_product_review_prepared_data 
WHERE 
  cscart_product_review_prepared_data.product_id IN (
    26620, 26633, 26799, 26646, 26628, 26635, 
    26645, 26623, 26626, 26651, 26652, 
    26627, 26640, 26629
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00058

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "9.81"
    },
    "table": {
      "table_name": "cscart_product_review_prepared_data",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "storefront_id"
      ],
      "key_length": "7",
      "rows_examined_per_scan": 14,
      "rows_produced_per_join": 14,
      "filtered": "100.00",
      "index_condition": "((`cscartdb`.`cscart_product_review_prepared_data`.`storefront_id` = 0) and (`cscartdb`.`cscart_product_review_prepared_data`.`product_id` in (26620,26633,26799,26646,26628,26635,26645,26623,26626,26651,26652,26627,26640,26629)))",
      "cost_info": {
        "read_cost": "8.41",
        "eval_cost": "1.40",
        "prefix_cost": "9.81",
        "data_read_per_join": "224"
      },
      "used_columns": [
        "product_id",
        "storefront_id",
        "average_rating",
        "reviews_count"
      ]
    }
  }
}