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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae4acfb99ab36e6f6023e9a66b948ce021852b45c28f9e1e154e19a7eef21fd' 
  AND token = 'E4MdM4n+kUsB7lAzyCXvjMVeorIo4XjvxcwsUNR6eGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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