Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc83118c520dc87a426941219bd927679d779422dd7b9a25bc009d73761eee2' 
  AND token = 'RzkaQCCRH14lgmQdjnOJCdPDd88MuXYk9dl4hZFkB4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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