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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b6ae3d6058486db7935675a9dcc3bb392cdbda47db3ee2b5b16c8ccc8a88b43' 
  AND token = 'ttz583moE/6TpfdcaakcZAt4EDA6b/Az0xm2WpEmH/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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