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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1768364828166663baf802b0bc742081d77b75b6113d95f46a6a4e36d756a710' 
  AND token = 'd3AtkWi0NRThwn3U9+bU8omUcjMi3erRnAqK/Z+mmIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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