SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    89, 1643, 1645, 1925, 1666, 1664, 1557, 
    1695, 1559, 1315, 1310, 1471
  )

Query time 0.00099

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 12,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (89,1643,1645,1925,1666,1664,1557,1695,1559,1315,1310,1471)"
    }
  }
}