Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8be50f781e046c05caff7b96a925731880187d6e90021ec86dfeda508b0bddc' 
  AND token = 'kc0JVC6fXnBDql2lB+3r6oiqK+3W6ghTmoyDZ61lrNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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