Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee1428fa038947c9254d28ba861f97215d2ee246b6a43351b7230a901564522' 
  AND token = '9OFLrMm+16skKn0vJCQ4jKkcXoXSkokbuYUuasaJeac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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