Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03bb39b84fc453be665741612750f47837370cb94a15eeb4b116405e46df8e82' 
  AND token = 'GH/BDzd20ezR98kgNvqEsGEc+QdIE8F3v35AXGT8zbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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