Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9fff53cee55df82badcbec010f47b737b7ad08a9abcfc9205e5455c4d7d2dc' 
  AND token = 'gzj2sXnAEgGk/ba5+9q6X0M/l4ZPBeVsZGaoq0fvrGY=' 
  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"
    }
  }
}