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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24cf612dd2fe623dc4b1b958b090f76f949e3624a84e9a598f0fef34cc6e7335' 
  AND token = 'NQd8I3KuCng1QQBxxrHLVDl0A949D4pwEhc2ziOebVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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