Heat olive oil in large skillet over medium-high heat and brown chicken, turning once, about 5 minutes. Stir in onions and celery, cook, stirring occasionally, until tender, about 2 minutes. Stir in broth, wine, olives, and lemon juice. Bring to a boil. Reduce heat to low and simmer covered until chicken is thoroughly cooked, about 10 minutes. Stir in lemon peel and Mayonnaise. Serve over couscous.