SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afcd01532bfb2430d86a59b2da418f791e1da8f93497c7b03d983b388a5529a7' 
  AND token = 'OAwbbVlkboJ4rVEYi8nBpxp/VO9RXyF1UJu0qvfEz/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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