Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d615b5e50605f3b91a2db2e2c11a573859d731b8bb0848356671af9670ce5e' 
  AND token = 'QREbkdRTQLH2BtXUJ8yESJrlbUW75p2eOv5GurXSwtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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