SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10657, 10658, 10659, 10661, 10663, 10664, 
    10666, 12599, 12616, 12601, 12605, 
    12612, 12613, 12611, 12596, 12607, 
    12610, 12609, 12597, 12615
  )

Query time 0.00068

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": 20,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (10657,10658,10659,10661,10663,10664,10666,12599,12616,12601,12605,12612,12613,12611,12596,12607,12610,12609,12597,12615)"
    }
  }
}