Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd493b6bfbcb77afacfa4bd2b72a2a125c3f51c3dfa636a1ac9954dfd52f45bad' 
  AND token = 'dibcfXcER3IKHZtrp5Vz6lAbsCxHnlyvkyNMIr7oJ1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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