SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    27857, 32752, 32753, 32754, 32755, 32756, 
    45640, 45641, 45642, 45643, 45644, 
    45645
  )

Query time 0.00084

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "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 (27857,32752,32753,32754,32755,32756,45640,45641,45642,45643,45644,45645)"
        }
      }
    ]
  }
}