Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89930e046beca81caba870c9eec8fb701a17d142c0d4e7ce33ca315d0319366b' 
  AND token = '5AEjfAe4ARIfEeAudNO0AWvQE0sEjlMBVAFFr8VKeRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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