SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac50d09bcd9cd38b40f4d00386913e1d6fa93d2250897758e5d24dccc57a3e87' 
  AND token = 'Bo5srXhE1OXpvJAYwyoXHBMGKGhBK5g8V/yXzXdAFsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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