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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89b23094a9c3e1af2553d57553cdf8ebe56e359c32aaface9cc9a7ba993d307' 
  AND token = 'CP7ag9HwC0FYqBqNh70u5wa1L2np36a2zJpnx1ZFIjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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