SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    33723, 6542, 1714, 857, 1412, 1123, 2513, 
    2966, 4269, 48849, 5761, 27370, 29700, 
    34678, 48062, 49288, 49281
  )

Query time 0.00146

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": 17,
          "filtered": 100,
          "index_condition": "cscart_products.product_id in (33723,6542,1714,857,1412,1123,2513,2966,4269,48849,5761,27370,29700,34678,48062,49288,49281)"
        }
      }
    ]
  }
}