Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91384e9e346f8581fe28919e53ad86ccbc40719881f74b093accd9ab78918210' 
  AND token = '6dgQ+uufPMJJzZk8NDwKhENqL8nMBXWJpE1BVtSVL00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}