Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a531cafee3a48d3a62c5122694a902175263d7bb22d7c8c35a792d6e403fb68f' 
  AND token = 'NDUT0cLXfxPM4mmzfQkGO926i5RDZN9wbvGQbEg4Ywc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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