Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '327d9d54de3f2eba0e145bfcec7d8d5b7e649de7de16e64bf280ff8aa79cd910' 
  AND token = '3fii4U6xt/e0XCP7iQfMYd4VSs8qKuzTLk3kH/93vWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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