Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ad2e2834b78e98d03b20a8daf25d74b8c40749a7f1e97960d97b6b16b00e16' 
  AND token = 'FyJitYKhDskTh9QqoRBRb2h6EkxKB3QZtOrqftmTQJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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