Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ddd0474c60917e3eaf54f65cc4aa9626a6d03f3cac74c6ad7741385b4fa9307' 
  AND token = 'a+j9DxJ0zLIIM7m55BNyFEJ5ZWkqH1c4Sm/QuhbFBaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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