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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 (
    6727, 1672, 1673, 1674, 1675, 1676, 1677, 
    1678, 1679, 1680, 1681, 1682, 1683, 
    1684, 1685, 1686, 1687, 1688, 1689, 
    1690, 1691, 1692, 1693, 1694
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00035

JSON explain

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