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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d61adf03cf5ee23f65a56f7f151cb23efb3397bdb9bc7ed5421e4bb38f0d8f' 
  AND token = 'kebnKW0SrFFC8jbZ4ysKkMlWnymifgIIPkGCZjIOC6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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