Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b839a26ea2eb643443cd6df4b27d6a012f2e57aa56ed3d747b830de637b140e' 
  AND token = 'zzAN8ykvILnKCBW3r7cXz4HJDNFN2lkJEPgPDsT/WZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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