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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb44e477ffe0bb4985c734d70329ec27bf7a2e84adfdc10f93833ad9f9d58ca6' 
  AND token = '3FL9b6+/36krVLWPZ0sQ3cl0HOjVc+VONmAd803h35Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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