Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2122ad1c73d86ee722ebf9cad2ef26f42337f1f328b2e0a5144f69515de3fe' 
  AND token = 'zdOtzxCgCsE+dFsZqNfyZ+ZSF5oZaJ/7tmoSI+hWWFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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