Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4e6cbca137073a9e7c4fa78691f19dc524ec0f0424b2ef98e687efafd604d7' 
  AND token = 'Oeu47mFdbvZ0CkDwNzHuaPdXUzPwKcdOC3INAIGfJ+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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