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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54f60e1ef4b425deba59156d6d5f376a8e9bbeccff9d90055af56009e18341c' 
  AND token = 'DLrxJk6qU2v9/jSIKlqxvzEnM82Tu0cUnCjXI6Ay5kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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