Preheat your oven to 325°F (163°C).
Mix graham cracker crumbs and melted butter until combined, then press into a 9-inch springform pan.
Bake the crust for 10 minutes and let it cool.
In a large bowl, beat cream cheese until smooth.
Add sugar and mix well.
Mix in sour cream, key lime juice, lime zest, and vanilla.
Add eggs one at a time, mixing on low speed.
Pour the filling over the cooled crust.
Bake for 50-60 minutes until the center is set but slightly jiggly.
Let cool before refrigerating for at least 4 hours.