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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f49d7e63a252dac5ace6055f3f789a9b8776c6f71d7656c210e1e0028dffc54' 
  AND token = 'qKubS6qU1gPLOR0SxqdTf/ZCYgA/HbWRo0p8ClodaVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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