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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e30bbaabb82395543c7c069a29602f1f234d3c5fd6d73f24b46d15b905e11b9' 
  AND token = 'qCj7Gk47WPU+axDiLZ+efRjq1+CwV5Ilr+NdbeE+QJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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