Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9324d43c7502c0da1a91b1fdc5623075dde019740d8b9e2a70edc0e9b46e3941' 
  AND token = 'AaYOL/9T9i7R1ZxDht1NzXKxr9nrK6/MEnsugqw1Jqc=' 
  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"
    }
  }
}