Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d73f05bef699058dc776c3a0fa399e73ac87c97e084b0d5fafdf1a83afe4382' 
  AND token = '5gupYK1ThebgMI6f/lny2ilk4/hLYxIlMya3XCxS8p0=' 
  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"
    }
  }
}