SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d43268c746b1aabf38b2f5cf9712cd09f5a91fd8cbdb9a65889e97538dc3306' 
  AND token = 'zh0lJsSvizAfZSMEtlHChDIM35FQu+SJgpUMe84m78Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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