Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d7931e1de650a8da92529238c3201b01481c6664ccc9d626fc66ddcdd4bdb5' 
  AND token = 'hXSpxNgU7asEV+PFD5Jp1eYTjTMbNFFTBSmtA4i66qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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