Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c41d4402f6cc52d09cf6c8d4d902eddd9b878773c4a67c0d18d5a2f410c7a27' 
  AND token = 'qO0zki8VmOaAe+T5aQJoR3CLuKhYDyfJi4yyhnS6Odk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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