Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed20158edc2ff398826dd8ae6bba20dfe9434fffad85685142724a92b52d34e' 
  AND token = '2ldaw1txL23WXesgL3gf/AzZYcEOcINNCe73np0/AAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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