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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24bb25d385dd6e97a44ea88a6548670f030a575fd35e175256cb57f2f7ce1ebd' 
  AND token = 'DCSuL97RwYQN9xIKxI4tUN6NmUqmIvzMqgsfJeBeauo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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