SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bb23db6f5f96cdaca1f68a64365aa83f6b93251fb082cbc316e8593df21257' 
  AND token = 'Gzw14jsEgkMicKRY/kuQzLX+e+CSPUdX6Pyv4U9CVyM=' 
  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"
    }
  }
}