Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dceab74b062736f750104e114ed0281fa0f486aca859d0bea59d1bdfd8bb2e9' 
  AND token = 'YM1r/7P9uB5eBMhRW5u6gGAJwHnv8w9J50CJI5WVW4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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