Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a49c22ee1d7e4cad1f5bd33b3196f71dc63a1f60b7db892d2ed70073ea4bba5' 
  AND token = 'QcpTznLT+JhDmrAPTI4EDSwncwXoe+roQIV2u1U+9DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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