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SELECT 
  ushop_product_review_prepared_data.product_id AS product_id, 
  ushop_product_review_prepared_data.average_rating AS average_rating, 
  ushop_product_review_prepared_data.reviews_count AS reviews_count 
FROM 
  ushop_product_review_prepared_data 
WHERE 
  ushop_product_review_prepared_data.product_id IN (194) 
  AND ushop_product_review_prepared_data.storefront_id = 0

Query time 0.00019

JSON explain

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