Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74eb6b94f7d5f4653b29003a7eadcc4ffcd9008273a8d5745efed68e1f170a32' 
  AND token = 'vBOJCexCgBmPbRoxoBsoPz519rFjVx91T/tQL65XJ6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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