Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c56b0f21629189c0dcf2940ec7dbd70d4601912bec87f6fadf6c41bf678042' 
  AND token = '2a3II6linlAGibQWSzAI7ie82Ct7ZFtrw05tXg3NWOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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