Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '477c0d6e63949ae49a7f1f5723d020d58729e995a8a22cf83e6179aa7bf0b09c' 
  AND token = 'VFk50GbDQgRpL3c7fR7ewJMDIQcGK3B50GM8bzRAasM=' 
  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"
    }
  }
}