SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3572372482730f7ba9a2a511cc1e0e69881edf87f06e4d2f07606c2aaf49b43a' 
  AND token = 'Kgz6XdCkNZTG+ssopygIj8RtuK9oaHy8qF5gVvNC8K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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