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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdad1ed57ce737e05c260271c5079cf98aa83034f6aee9fe3866a03a318e8fe' 
  AND token = 'krwGTsSHxOH7tIsXQYFj+CMIZqC2a8us1imBndnwHnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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