Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e55bdc44c40c977c2e86197c4880cc3011d4b239b6203c757a5d77e6088bade' 
  AND token = 'u3Veoxj3ctqd0yzOvEhQwk/LZLhCXKO7+fHkxeSc+bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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