SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177f898703d9319fd89223690cf9ed05934d9f08de587dace424509e6113f6a5' 
  AND token = 'YZfVPB+Yfhcje/xgWCgPKZLzW+z7XgaTXhSfmbhKuqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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