Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3e91f5f429ac22d9fe131edf2fe501b26a4c806155405c40398678e2ae41a7' 
  AND token = 'IqHiRxh+KknN0Iex9YTa9t9BMN96a2kaVFFBlTsp23w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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