Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120f67aa8c3ff62a2c85ef8796e7699678278f965a96a65bb239bb7eed2e5b18' 
  AND token = 'wFY0j3JXPmAb4RerePEmTk2WYl6dQ/sV8vrv3zbOGQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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