Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84507443ab69e26c80e7707c53a08c35d4969084e32ed5f55b23cb56fb148f0d' 
  AND token = 'RXf8wHVhXwT2eOC6oOlFaIxLOMc0/50oNTiJgvQZM/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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