Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6f632c871a0040630d3cb5a9e6d55226905036f9e9b030552f6c25f2641ea8' 
  AND token = 'iqFGw8Bk08GjqmWXrsiIzgkz0JdQ2w7VDtwA4O41v9Y=' 
  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"
    }
  }
}