Mindfulness is not a complicated practice that requires a long stretch of time, it is a simple skill, being fully present in this current moment.
Most of the time, our minds drift between the past and the future, without being fully present where we actually are. Mindfulness brings us back to now.
A simple method, while drinking your coffee, take three sips while noticing its smell, its warmth, its taste. This small exercise gently brings the mind back to the present.
Mindfulness does not remove anxiety completely, but it strengthens your ability to notice your own mind before it drifts away from you.