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 (
    9, 10, 19, 21, 50, 51, 49, 48, 54, 153, 164, 
    248, 65, 64, 63, 62, 66, 140, 141, 144, 
    143, 142
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00026

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_product_review_prepared_data ALL PRIMARY 99 Using where

Result

product_id average_rating reviews_count
248 4.33 3