Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c70e14c2f5fc7605c1cfea51b9b043fe62e242f1205d859f2f332507f6cc572' 
  AND token = 'RCh6d5nGiGjfi7Zjshzh1DE7w1xTFAs2gBRULRbayMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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