First, there's a way you could do this without Rule Machine at all (besides webCoRE) if you want, though it does involve combining a few different things to get what you want:
- Use this app to turn your contact sensors into (different) virtual motion sensors: Contact-Motion app, which opens up the possibility to use contact sensors in places where many "standard" apps assume motion sensors
- Use a Zone Motion Controller to tie those two sensors into one and require "activation" of both within your specified window (1 minute) in order for the "zone motion" device this app will create to become active. Use the "False Motion Reduction" type of zone.
- Now, use this zone motion sensor in any app you want: Simple Automation Rules (formerly Simple Lighting), Motion Lighting, or (I wouldn't start here but it's still an option...) even Rule Machine.
If you did want to go straight to RM, I still see it being best done with a couple rules, though I'm thinking you might be able to get it down to one as long as you don't expect quick (probably <1 second and probably really even less) changes in both sensor states. That's another story but I could share what I'm thinking if you did want. 
