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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c88e88053a4920d6994412636d70ea6fc0500ae767445b18269156a49ba9847' 
  AND token = '/7jgREZThZHfS1U7erb9oPS4JBtgHZhB/xDga5vKXnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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