SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    1003, 1685, 2173, 3105, 2265, 3108, 3113, 
    3115, 3109, 3114, 3106, 3107
  )

Query time 0.00080

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 (1003,1685,2173,3105,2265,3108,3113,3115,3109,3114,3106,3107)"
    }
  }
}