Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f712775636d0ec1f2fea7f2fcc9621f9a817cbd8a55f1e0df74048d5129cc37' 
  AND token = 'MdFREF6vc5fFqCRjgtp+/M4TsmwRi//djLV4NWjUTBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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