Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cfd7e3a641782d1c08488fa44a1ab29c56b7c08e3780c16cc3f3b8ae0cb25d9' 
  AND token = 'IteHujb4+P6avul+JSgDw6OP2oSDX0PjnGj5JNYHjbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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