Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf407278f5a5068607fff3b52409a984f41e71ea9958e40c386b7d819b437e3a' 
  AND token = 'XjzCpDpyIjlGHertG52rUIf9axuFQ9kNRyWnnnj9xtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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