Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10c4188efe69f21bbc977d586961274a15fb1f4c309ffd6bcacbcbea9e20f5c' 
  AND token = 'EqDt32uMRtKDwzRdimbo3+jhd/qcVk0DOWOk8D2GvUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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