SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1318377ec08d67221dff19f79f3c66619476a16f546d6812c5a79e39d75eb581' 
  AND token = 'JUGTz/2Ph0Y4ZgzfuJCSlnJAC0Snr9IXJqiVdObtSpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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