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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 (
    6843, 6840, 6841, 6846, 3477, 3452, 3478, 
    3479, 3453, 3491, 3488, 3497, 3495, 
    3489, 3492, 3496, 3490, 3494, 6951, 
    3502, 3503, 3493, 3498, 3428, 5802
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00021

JSON explain

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