Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d2cc32af4edb65bacb6d2abb2d3eadb1eff3fbf56b02ace4306a7fb9f6a1e9' 
  AND token = 'ETxdMRi0FjDjolk2VB6NsVzFeYUiXi4WAlsc8BjzcA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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