Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c21add6f0b7ce50827082832fe87cf5a2d2d0e550d7b9e0f90f56f567e1afb6a' 
  AND token = 'HFl3pmnX/8jVSMZfY0zI/vnw1xxlIj9jdvijdvTG0KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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