Went from the
Disneyland Paris area to CDG and it was a quick 40 minutes drive. Parc Asterix is 10-15 minutes up the highway from there, so you should have no issues.
For Parc Asterix, download their app and book their lowest level of "Filotomatix". Its around 15 euros per person and its like the old Fast Pass + system at WDW. Every coaster except for Toutatis this year is on it and you can save a lot of time. Food wise, my go to spot is the "Relais Gaulois" near the log flume. It is a "Self Restaurant" which is a cafeteria in the US. Go in, grab a tray and grab drinks, appetizer and dessert. Order a main dish at the cashier and find a table after. With the ticket from the cashier, you walk to the appropriate station and you can get a beef steak (15 euros), boar skewer (15-16 euros), etc. What's nice is that there is all you can eat hot side dishes buffet included with your main course. The restaurant though is only open from like 11:30-12:00 to 15:00.
Are you going during halloween?