SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8837b8fd6ecc28a14e8af4d423f4385864f6967ae80c96d95591522f45d14773' 
  AND token = 'DY/QqvCqz1MDPmtxbVc/F6dIZ77fl1G0HyXeK8PMvGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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