SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad45c9c671098efd313471542718fd88103bf49e78a040993aef21835119b95' 
  AND token = 'oaVIQhDCoBUazgjbXJZEYWO9CCVEC2GPmbpSqbU8GvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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