Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9e7f8bfbd0907088d97ebc53f1f0a3dff42f7927a0e4a555d8dd492dcf0cd3' 
  AND token = 'ZJy09cb+Nt6PoZXLfQJEw/eLXFYiBGVlI/3VaGUEVy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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