Combine the white wine vinegar, Champagne vinegar, water and sugar in a saucepan. Bring to a boil, stirring until the sugar has completely dissolved.
Remove from the heat and add the honey, stirring until incorporated. Stir in the coriander seeds, peppercorns and red chile flakes.
Pack the celery and bay leaves into a clean 1-quart jar. Pour the hot brine and spices over the celery, making sure it is submerged. Let cool to room temperature, then cover and refrigerate.
The celery will be ready to eat after 24 hours. Keep refrigerated.