Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42bf2559e1467b7ad7b1168a23400b366eb00ba9dd45dcc4fd462d06d895652e' 
  AND token = 'l+UfD7OIqp5XDkXNVoKa41a/qSxXPJALqWNJxoK2YZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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