Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '127f802143d31f2444e354bd9203fefd431699ab83042da6f981d48017af85f3' 
  AND token = 'bLZ7c3xMXs4xlCRSHdCa7BhT4Ent2ZhLaUDf+WLtYAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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