This is possible using the ACSM accounts system, if you follow the steps below the Live Timings page will be publicly available and any other page would redirect the user to a login page:
Go to the Server → Accounts page in ACSM
At the bottom of the page ensure that Public Access is enabled
Find the “Public” group in the Groups list and click the Edit button for it
Disable every permission for that group other than the Live Timings - View permission