Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '846087a554bc264010520a5c1f96ca378ce4039792a37f61e6bfa35ca4d5d777' 
  AND token = 'FM/a28DLDzITqAMXz5VeY3ik5DNys0WiH9dHGL8impw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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