Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a198af8ba2bf0a070462980ddf0fbab82ee77cb5196fac177d06c1110d2b090d' 
  AND token = '1I/sscxjzejXUnraOzXFVOixtZ1Z92aua2Pju7DgaWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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