SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918fbbd9fc82ba02df90e4546a56e0c7651144f40411a1959d9f43536fc09228' 
  AND token = 'SgHFn4OJpvfCzyk4d1JrqGM5B3NjiHmF1VjjCMFvmow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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