Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98ab671cad3ee7d2d8bd9f4ab9b075855f9cabf8c04558031f371b925136c1f' 
  AND token = 'BK4BbIqOx0Da+Y1oVJ0TQne9O26lQq77jWfWAkYm+zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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