Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab0ff27e9c8745a369bac8383ebbfd38fedafd647476609656ec82de04bff3c' 
  AND token = 'cSxWHJtGxGjJ8o2qfWWfQRDAZbccqQ8DbndKd4/fS6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}