Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26f76a5b5a7372a8fadc2e6443e93105ed4c5c5b313e60d66e8a27da1e70113' 
  AND token = '27A7C27Yzrzk6SsxjROv5Zrqeus8BN6BF70CitMmt+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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