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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350b21c860afb019d5ab94d12887eec5e242187d9e6ff1ff8f1c5220538977d0' 
  AND token = 'RQiI/2yBG92NAV81kHlg1wCZb629HDxD9881aRlYPm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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