Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd41bae24e896a1a95f819b25295d8ef3a535fd3e5a330ce321fe365ae8cce49' 
  AND token = 'UYkiHY+Nm0IR6O+hqlIEbfQh3Pe2PSdQXzWOM93+Gy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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