SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    65854, 65866, 65857, 65876, 65858, 65856, 
    65860, 65859, 65861, 65873, 65882, 
    65965
  )

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": 12,
      "filtered": 100,
      "attached_condition": "cscart_products.product_id in (65854,65866,65857,65876,65858,65856,65860,65859,65861,65873,65882,65965)"
    }
  }
}

Result