Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd459aaea1158d26a387c9a1b7fb3b31f80bd1910df21787b04139216e0f0afc' 
  AND token = 'ni5FfKeT/n/f+Kw6v+cZcWXykKWP/NoB9jk8ucKVqIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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