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 (
    618, 626, 641, 451, 438, 546, 449, 554, 
    548
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00004

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_review_prepared_data",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "7",
      "used_key_parts": ["product_id", "storefront_id"],
      "rows": 9,
      "filtered": 100,
      "index_condition": "cscart_product_review_prepared_data.storefront_id = 0 and cscart_product_review_prepared_data.product_id in (618,626,641,451,438,546,449,554,548)"
    }
  }
}