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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed21f424a4172db476b9bfcf846e8259e11d6d5e94727a8b8c093d952c9359f' 
  AND token = 'qiYiF3tGVzEBWlEoLGt7fCA5WrpuLwaYTRTo3yHcZ8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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