SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10781, 10782, 10783, 10784, 10785, 10786, 
    10787, 10788, 10789, 10790, 10791, 
    10767, 10768, 10769, 10770, 10771, 
    10772, 10773, 10774, 10775
  )

Query time 0.00058

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 (10781,10782,10783,10784,10785,10786,10787,10788,10789,10790,10791,10767,10768,10769,10770,10771,10772,10773,10774,10775)"
    }
  }
}