Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebc437ba4c32761cf503f7d5c4bbd9fca0c4ab34e30211dc21a886bf43ae3c1' 
  AND token = 'VJnronKA81m7RmWrzR3EkzvzfWjQjVouyBnUFT8sOK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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