Sandbox

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 (
    51014, 51045, 51025, 51029, 51020, 51027, 
    51031, 51028, 51033, 51026, 51042, 
    51030, 51032, 51035, 51041, 51038
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 1

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "Impossible WHERE noticed after reading const tables"
  }
}