Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d691da96f6256c5796640e6865072c0185fedf8c573aa975916b93a8969399' 
  AND token = '99vw0gLvSytcavXNFCOCblYkZl5YPadP7xXHaNhrFo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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