Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52902e080c92b7ecc42e4c1a40621eb3b682965ebc46a0e5da44d42adc8d29cc' 
  AND token = 'x15cl958SaMOuT4GDGVSo6Svrj5VdK7dh6GqNRUN4b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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