Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71a3c4166a283703d1011030fd8be1ba16f2a713b98bc2717c66bcc37c0a56d' 
  AND token = 'xofgK5bzI4EELEFK2zkRd/KfFllOUkcfFFcPsd03kxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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