Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0bbd628b287d9f87c4b200340401f8c13be203e6444dba7c23b427256cc1c75' 
  AND token = 'sb++RlIi+x7jIAUiDzRN9bnyYiV7PWiymO5C3wUk70c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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