Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c0e4d71899b75b12e31f042b5fe979d0c92ec8de95581f1e3d2bf3a3bdabe0' 
  AND token = 'pYSsLWzAVRHhYA40/GSfWL5FLgRzNGUJgjnyd8Wfg8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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