SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72de0755bec0a4fe1571a284270c93e9770dcb1c8c2b3976b367388d14f258fe' 
  AND token = 'w/JI05aNUm6NkAAwku6P3wHhQOzGBvY8kxnXo8jyoLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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