Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd30483e50ecc63bceb799e65f1453df5774ec872883916b52c7cf047fa0c37' 
  AND token = '8qW93zvfLL5E0cJWhYZ56RgAvxv0WCcTNZQnHdghjWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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