What's the most reliable way to travel between Phoenix MarketCity and Mumbai Airport?

It seems, that I'll have few hours of spare time between getting to Mumbai Airport and actually checking-in to my plane. Thus, I thought about visiting Phoenix MarketCity in between, after I drop-off my luggage at the airport. Google Maps showed me, that both location are quite close to each other.

What is the safest way to travel between these two places? By "safest" I mean solution that can get me there an back on scheduled time, without too much delay, sticking in traffic jam etc. Or maybe, my entire idea is wrong, due to possible problems in getting to Phoenix MarketCity and back to airport?

My plane takes off very late in the night, so I'll be travelling to MarketCity close to its closure. For this reason, I assume local buses are not an option around 00:00-01:00, right? Even though I saw bus stop at Google Maps directly next to Phoenix MarketCity, I assume, that there will be no bus service at all at that time or bus frequency will not grant safe traveling in terms of time (late bus or off-routed bus).