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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e15797094cca6cee93a8e616c08148132c070aa9da480c30eb2cd5bd6f706f1' 
  AND token = 'woHOTiyFxLjjF3Oloq2DxT5zHf0eW9aEXTTZuo1MS1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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